Foreign workers to be employed in Singapore require a valid job offer and employer who sponsors the work permit application. There are many types of work permits according to skills levels. There are Work Permit for unskilled labor, Employment Pass, for skilled professionals, and S Pass for mid-skilled workers. The most essential requirements are age limits, medical checks, quotas, and levies. Employers who hire unskilled workers are also required to provide a security bond. Employment laws in Singapore have to be followed, since one does not want to be punished or worse, deported.
https://www.oasis-india.com/requirement-for-work-permit-in-singapore/